Detachable hook for roof ladders



Dec. 18, 1928. 1,695,428

J. A. JOHNSON DETACHABLE HOOK FOR ROOF LADDERS Filed Oct. 25. 1927 In 7116 Z%1'01-116 Patented Dec. 1 8, 1928.

UNITED STATES E211 ALJOHNSON, or WESTON, MASSACHUSETTS.

DETACHABLE HOOK FOR ROOF LADDERS, I

' Application filed October 25, 1927. Serial r10. 228,569.

My invention has numerous objects, the principal of which are the provision otmeans whereby a ladder-hook may be quickly, easily and securely fixed to or detached from a ladder; maybe likewise adjusted, to be detachably secured to various ladders whose rounds are at different distances apart; and of means so formed that its operating parts, when connected to a ladder, allow persons or objects moving over or coming in contact with its said parts, to pass smoothly and uninterruptedly over them without being caught by, and causing them to unlock the roof-hook from the ladder.

Further, my invention is, in structure, simpleand strong; few in parts; and is easily and cheaply manufactured.

In the drawings illustrating tl'ieprinciple of my invention, and the best physical structure now known to me, embodying the same,

Fig. 1 is a section of a ladder, showing my invention secured thereto Fig. 2 is a similar View, the invention hang.

ing on the top round of the ladder, and ready to be looked to, or removed from the ladder; while Figs. 3 and 4 are, respectively, a top and a bottom plan of my invention.

Two members, 1 and 2, Figs. 1, 2 and 4:, are longitudinally slidable upon each other, and movably secured together by headed rivets 3, 4, fixed to the member 1 and passed through a longitudinal slot 5, in member 2. The free end portion of the member 1 is formed into a suitable roof hook 6, while to the base of the shank is fixed, by two rivets 7, a small hook 8 to engage, say, the top round 90f a ladder. The free end portion of the member 2 is bent to form a corresponding but oppositely bent hook 11 to engage an adjacent but lower round 12 of the ladder. To the top portion of member 1, and secured thereto by rivets t and 13, is a pair of ears 14 in which is pivoted the end portion 15 of an operating bar 16, by a pin 17 passing through said ears and said bar.

Fixed,by rivets 18, to the top freeend portion of member 2, next to the round hook 11, is a pair of ears 19, between which is pivoted by a pin 20, a hand lever 21, through which are a series 22 of adjusting holes, into any one of which a pin 23, on the free end portion of the operating bar 16, may be sprung for the purpose of operatively connecting and disconnecting the operating bar 16 and hand lever 21.

To attach the laid upon the top .end portion of the ladder,

It will be noted that 'the ears of this pair 19, Fig. 3, are tar enough apart to permit between them; that the pivot pin 23, cennecting the operating bar 16 and the hand lever curvature, and when in the position shown in Fig. 1,-oll'er no resistance to objects'or persons moving over the same. I will now describe'the operation of my invention, it being first assumed that the parts are adjusted to allow the roof-hook 6 to be attached to a standardladder 10, that is,having its rounds at a definite distance. apart, say onefoot. Y j

root-hook, the appliance is as shown in F ig- 2, the top round hook 8 catching over the top round 9, while the lower member 2 has its lower round hook 11 below said lowerround 12. Next, the hand lever 21 is seized, and quickly brought down to the position shown in Fig. 1, the hand lever turning upon its pivot 20, in theears 19 on the member 2, and also upon its pivot pin 23 in the end portion of the operating bar 16, thereby forcing the member 2 to slide longitudinally along the member 1, and bringing the lower round hook 11 against the lower ladder round 12, and causing the two round hooks 8, 11, to longitudinally grip the rounds 9, 12, with great pressure; but as the hand lever 21 has passed the dead centre20, the

' resistance offered by the rounds to -the round hooks, tends to move the hand lever still farther past the dead'ecentre, and thus to prevent the hand lever to move oppositely and unlock the roof-hook 6 from the ladder.

To detach the roof-hook, the hand lever 21, as shown in Fig. 1, is raised, as appears in Fig. 2; the lower hook 11' disengages the lower round 12, and the invention may be lifted, away from the ladder.

It the ladder is'not a standard one, and the adjacent rounds are more or less distance apart, then those of the standard ladder, then, by removing the cotter pin 24, in the pivot pin 23, connecting the hand lever and the operating bar, and by springing the pivot pin into, say, the next hole of the series 22, and replacing the cotter pin24, the round hooks will the operating bar and the hand lever to lie become adapted to successively detachably secure the roof-hook to this particular ladder.

As already pointed out, the outside curved surfaces of the hand lever 21 and the operating bar 16 are smooth and otl er nothing to resist movements of bodies contacting them, and perchance cause injury to them or cause the hand lever 21 to move the hooks 8, 11 out of locking engagement Withthe rounds 12, 18, ot' the ladder.

Havin described the structure and operation of my invention, and desiring to protect the same silole What I claim is:

1. A detachable hook for roof ladders, eo1nprising two members movably secured together and longitudinally slidable upon each other, one of said members having its free end portion in form of a hook to a round of a ladder, the other of said members having its free end portion in the form of a hook to engage a support 1 a roof, and a hook t engage another round oi the ladder; a hand lever pivoted to one member; and an operating bar pivoted to the other member and having its free end portion pivotally connected to the hand lever, whereby opposite move ments of the hand lever will cause said hook members to slide longitudinally in opposite in the broadest manner legally posdirections,.and engage or disengage said rounds.

2. A detachable hook for roof ladders, comprisingtvvo members, movably secured to gether and longitudinally slidable upon each other; one of said members having its free end portion in form ofa hook to engage a round of a ladder, the other of said members having its free end portion in the form of a hook to engage a support as a root, and a hook to engage another round of the ladder; a hand lever pivoted to one member; an op erating bar pivoted to theother member, and having its free end portion pivotally connected to the hand lever,- whereby oppositemove ments of thehand lever Will cause said hook members to slide longitudinally in opposite directions, and engage or disengage said rounds, said lever and said operating bar and their pivot being so designed and located thatothe hand lever, in moving the hook memhere into engagement with the'round of the ladder, causes the pivotal connection between the hand lever and the operating bar,t0 pass by their dead centre, and thereby securely lock the detachable hook to the ladder.

In testimony whereof I hereunto affix my signature.

JOSEPH A1 JOHNSON. 

